Battery cell and battery pack
By designing the split cover plate and shell, setting up a through groove and shielding ring, and integrating explosion-proof valve, the problem of the injection holes of the pole ear or high-temperature tape during liquid injection processing is solved, and the performance, processing efficiency and safety of the battery cell are improved.
Patent Information
- Application Number
- CN202422117345.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-29
AI Technical Summary
During the liquid injection processing of power batteries, the electrode ear or high-temperature tape is easy to seal the liquid injection hole, which leads to difficulty in injection, affects production efficiency, and may lead to short-connection of the sealing plate with live components such as the electrode ear, resulting in safety hazards of shell leakage.
A battery cell structure is designed, in which the cover plate and the shell are arranged separately, and a through groove is provided on the cover plate, and the pole group is located in the shell, and the pole ear is led out from a position opposite to the through groove, one end of the connecting piece is connected to the pole pillar, and the other end extends to the through groove position and is connected to the pole ear, so that the pole pillar, the connecting piece and the pole ear are arranged in a dislocation in parallel direction, saving space. Multiple shielding rings are provided on the sealing plate, and communication grooves are provided on the shielding rings. The insulating pad is fixed to the sealing plate through the snapping block, and the explosion-proof valve is integrated on the cover plate.
Through the split cover plate and shell design, the internal space of the battery cell is saved, the installation space of the pole group is improved, and the performance of the battery cell is improved. The design of the shielding ring and communication groove avoids the sealing of the liquid injection hole, improves the efficiency of liquid injection and vacuum extraction, and reduces safety hazards during the battery cell processing. The fixing design of the insulating pad improves the processing efficiency of the battery cell, and the integration of the explosion-proof valve improves the safety factor of the battery cell.
Smart Images
Figure CN222995566U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power batteries, and particularly relates to a battery cell and a battery pack. Background Art
[0002] Power batteries are the main power sources of new energy vehicles, responsible for providing continuous and stable electrical energy for the vehicles. A power battery is composed of multiple battery cell units connected in series. Each battery cell structure includes a pole group inside and a housing. Positive and negative pole tabs are provided on the pole group for leading out the current of the pole group, and a pole post is provided on the housing. The pole post is connected to the corresponding pole tab through a connecting piece, thereby connecting the battery cell to the circuit. After the battery cells of the power battery are assembled, it is necessary to evacuate the inside of the battery cell from the liquid injection hole of the battery cell, and then inject liquid electrolyte into the battery cell, so as to improve the performance and service life of the battery.
[0003] In the related art, in order to facilitate the connection of the battery cell to the power supply circuit, the pole posts and liquid injection holes of some battery cells are both provided at the top of the housing. The pole tabs led out from the pole group are arranged on the lower side of the pole post. A connecting piece is provided on the lower side of the pole post. Since the pole tabs need to be directly or indirectly connected to the pole post, the pole tabs need to be arranged near the pole post. The pole tabs led out from the pole group are arranged on the lower side of the pole post. A connecting piece is provided on the lower side of the pole post. The connecting piece is arranged in a U shape with two parallel connecting parts. The two connecting parts of the connecting piece are arranged up and down relatively. One connecting part is connected to the bottom end of the pole post, and the other is connected to the pole tab, thereby realizing the connection between the pole post and the pole group. At the same time, in order to prevent the sealing plate from being short-circuited with structures such as the pole tab, an insulating pad is usually provided on the lower side of the sealing plate to separate the sealing plate from the lower-side structures.
[0004] However, in the above-mentioned related art, since the positions of the pole tabs and the liquid injection holes are relatively close, during the process of evacuating the inside of the battery cell and injecting liquid electrolyte into the battery cell, the pole tabs are disturbed by the airflow or liquid electrolyte, and the high-temperature tape for fixing the pole tabs is likely to block the liquid injection hole, resulting in difficult liquid injection and affecting the production efficiency. In addition, the insulating pad is disturbed by air, electrolyte or other components, and it is possible that the insulating pad deviates from its original position, and then the sealing plate is likely to be short-circuited with charged components such as the pole tab, generating a safety hazard of shell leakage. Summary of the Utility Model
[0005] In view of this, the utility model provides a battery cell and a battery pack to solve the problem that during the liquid injection processing, the pole tabs or the high-temperature tape are likely to block the liquid injection hole, resulting in difficult liquid injection and affecting the production efficiency.
[0006] In a first aspect, the present utility model provides an electric core, comprising: a housing with an opening on the upper side; a cover plate, the circumferential contour of which is adapted to the shape of the opening of the housing, a pair of pole columns are installed on the cover plate, the pole columns penetrate through the cover plate, and a through groove is arranged between the pair of pole columns on the cover plate; a pair of connecting pieces, one end of each connecting piece is connected to the corresponding pole column, and the other end extends to the position of the through groove; a pole group, which is arranged in the housing, an electrode tab is arranged at one end of the pole group, the electrode tab extends upward and bends towards the connecting piece, and the bent part of the electrode tab abuts against the upper surface of the connecting piece; a sealing plate, the circumferential contour of which is adapted to the through groove, a liquid injection hole is arranged on the sealing plate, a shielding ring is arranged at the position of the liquid injection hole on the lower surface of the sealing plate, at least one communication groove penetrating through the circumferential side wall of the shielding ring is arranged on the shielding ring, a plurality of clamping grooves are further arranged on the lower side plate surface of the sealing plate, an explosion-proof valve is arranged on the sealing plate, and the explosion-proof valve is located on one side of the sealing plate; an insulating pad, which is arranged on the lower side of the sealing plate and has a shape adapted to the sealing plate, a plurality of clamping blocks adapted to the corresponding clamping grooves are arranged on the upper side of the insulating pad, and the clamping blocks are clamped with the clamping grooves.
[0007] Beneficial effects: The cover plate and the housing are separately arranged, which is convenient for installing accessories such as the pole group into the housing. A through groove is arranged on the cover plate, the pole group is located in the housing, and the electrode tab is led out from a position opposite to the through groove, which is convenient for the staff to weld the connecting piece and the electrode tab. Since one end of the connecting piece is connected to the pole column and the other end extends to a position opposite to the through groove and is connected to the electrode tab, the pole column, the connecting piece and the electrode tab are arranged in a staggered manner along the direction parallel to the plate surface of the cover plate, saving the space in the housing along the height direction and providing more space for the arrangement of the pole group, thereby improving the performance of the electric core. In addition, although the electrode tab is arranged near the liquid injection hole, due to the arrangement of a plurality of shielding rings on the sealing plate, the shielding rings are located on the lower side of the sealing plate and surround the circumference of the liquid injection hole. During the liquid injection or vacuum pumping operation, even if the high-temperature tape fixing the electrode tab is disturbed and separated from its original position, it is not easy to block the liquid injection hole under the limitation of the shielding ring. At the same time, the communication grooves arranged on the shielding ring provide a more sufficient space for the passage of air flow and liquid flow, making the vacuum pumping and liquid injection processes faster and further reducing the possibility of the liquid injection hole being blocked, so it is not easy to affect the assembly and processing process of the electric core. The insulating pad arranged on the lower side of the sealing plate is fixedly installed with the sealing plate through the cooperation of the clamping blocks and the clamping grooves, enabling the insulating pad to be firmly combined with the sealing plate while being quickly assembled to the sealing plate, improving the processing efficiency of the electric core. In addition, by integrating the explosion-proof valve on the cover plate and locating it on the upper side of the electric core, when the explosion-proof valve relieves pressure on the thermally out-of-control electric core, it can more smoothly discharge the gas generated inside the battery, improving the safety factor of the electric core.
[0008] In an alternative embodiment, a plurality of the communication grooves are provided, and the plurality of communication grooves are evenly spaced in the circumferential direction of the shielding ring.
[0009] Beneficial effects: The communication grooves are arranged at the gaps between adjacent shielding rings, thereby forming a channel for ensuring the passage of air flow or liquid electrolyte between the shielding rings on the periphery of the liquid injection hole. During the liquid injection process and the vacuum pumping process, the efficiency of air extraction or liquid electrolyte injection can be improved, thereby improving the processing efficiency of the battery cell. In addition, since a plurality of communication grooves are provided and the plurality of communication grooves are evenly distributed in the circumferential direction of the liquid injection hole, when the staff performs the liquid injection or air extraction process, the flow direction of the air or liquid electrolyte passing through the communication grooves is prevented from being overly concentrated, which may cause strong disturbance to the structure around the liquid injection hole. In particular, it is possible to avoid the disturbance of the air or liquid electrolyte to the tab and the high-temperature adhesive, resulting in the high-temperature adhesive and other structures being displaced from their original positions and blocking the liquid injection hole, which affects the processing of the battery cell.
[0010] In an alternative embodiment, the communication groove extends to the end face of the shielding ring away from the liquid injection hole, and the distance between the end of the communication groove close to the liquid injection hole and the lower orifice of the liquid injection hole is 0.05 mm.
[0011] Beneficial effects: By controlling the distance between the communication groove and the lower orifice of the liquid injection hole, when the distance is too large, the guiding effect of the communication hole on the air flow or liquid flow is weak, and it cannot meet the requirements of rapid vacuum pumping or rapid electrolyte injection. At the same time, when the distance is too small, the structural strength of the shielding ring at the position where the communication hole is opened is weak, and it is easy to disintegrate under the disturbance of the air flow or liquid flow, resulting in structural failure.
[0012] In an alternative embodiment, the width of the communication groove along the tangential direction of the shielding ring is d, and d≥0.25 mm is satisfied. The height of the communication groove along the axis direction of the liquid injection hole is h, and 0.5 mm≥h≥0.3 mm is satisfied.
[0013] Beneficial effects: Since the communication grooves are evenly spaced on the shielding ring, by ensuring the length of the communication grooves, there is sufficient space between adjacent shielding rings, so that the shielding ring has sufficient elasticity, and during the assembly process of the battery cell, it is possible to avoid hard contact between the shielding ring and structures such as tabs, resulting in scratching or tearing of the tabs and affecting the performance of the battery cell.
[0014] In an alternative embodiment, the height of the shielding ring along the axis direction of the liquid injection hole is H, and H≥0.5 mm is satisfied.
[0015] Beneficial effects: By controlling h and ensuring H ≥ 0.5 mm, the ability of the shielding ring to prevent the liquid injection hole from being blocked is further improved. When the high-temperature tape is attached to the end of the shielding ring away from the cover plate, due to the sufficient height of the shielding ring, there is still enough space for air flow or electrolyte to flow through the gaps between the shielding rings, ensuring the smooth progress of processing and enabling the sufficient injection of liquid electrolyte into the battery cell to ensure the wetting effect of the liquid electrolyte in the battery cell.
[0016] In an alternative embodiment, the clamping block includes a plurality of elastic protrusions distributed in a circular array. The elastic protrusions include a root portion and a clamping portion. The root portion is connected to the insulating pad, and the clamping portion is disposed on the side of the root portion away from the insulating pad and extends toward the circumference of the clamping block and engages with the clamping groove.
[0017] Beneficial effects: The clamping block is formed by arranging a plurality of elastic protrusions in a circular array. During the process of the clamping block entering the clamping groove, the root portion is used to connect the clamping portion to the insulating pad. The clamping portions of the respective elastic protrusions are displaced toward the axis direction of the clamping block under the extrusion of the notch of the clamping groove. After the clamping portion of the clamping block enters the inside of the notch of the clamping groove, the clamping portion expands in the direction away from the axis of the clamping block under the action of elasticity, so as to be clamped into the clamping groove, realizing the combination of the insulating pad and the sealing plate.
[0018] In an alternative embodiment, the width of the root portion in the radial direction of the clamping block is W1, and 1.2 mm ≥ W1 ≥ 0.35 mm is satisfied.
[0019] Beneficial effects: By restricting the width of the root portion, it is prevented that the elastic force of the elastic protrusion is too large due to the excessive width, resulting in the difficult assembly of the sealing plate and the insulating pad. At the same time, it is also prevented that the combination strength between the elastic protrusion and the insulating pad is weak due to the too small width, resulting in the easy detachment of the elastic protrusion from the insulating pad, improving the reliability of the structure.
[0020] In an alternative embodiment, the width of the clamping portion in the radial direction of the clamping block is W2, and W2 ≥ 0.5 mm is satisfied.
[0021] Beneficial effects: By restricting the width of the clamping portion, the clamping block and the clamping groove have sufficient contact area to prevent the clamping block from withdrawing from the clamping groove after entering the clamping groove, thereby improving the combination reliability of the insulating pad and the sealing plate, and avoiding the situation that the insulating pad falls off or deviates from its original position from the sealing plate, resulting in a short circuit between the charged component and the housing, and further causing a housing leakage accident.
[0022] In an alternative embodiment, the thickness of the sealing plate is T, and 1.8 mm ≥ T ≥ 1.2 mm. The thickness of the root part is t1, and the thickness of the engaging part is t2, and 0.55 mm ≥ t1 ≥ 0.25 mm, 0.55 mm ≥ t2 ≥ 0.2 mm.
[0023] Advantageous effects: By controlling the ratio of the thickness of the sealing plate to the thicknesses of the root part and the engaging part of the elastic protrusion, it is possible to avoid the situation where the thickness of the sealing plate is too low compared to the elastic protrusion, resulting in weak strength of the sealing plate and easy damage. At the same time, it also avoids the situation where the thickness of the sealing plate is too large compared to the elastic protrusion, resulting in too small a size of the elastic protrusion and affecting the stability of the insulating pad.
[0024] In a second aspect, the present utility model also provides a battery pack, comprising: a plurality of the above-mentioned battery cells.
[0025] Advantageous effects: The battery cell group in the battery pack is composed of the above-mentioned battery cells, thereby improving the reliability of the battery pack. By providing a shielding ring structure, the situation where the tab and the high-temperature adhesive block the liquid injection hole is avoided, and the processing efficiency is stabilized, thereby indirectly improving the production efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0027] Figure 1 It is a schematic diagram of the overall structure of a battery cell according to an embodiment of the present utility model;
[0028] Figure 2 It is a battery cell according to an embodiment of the present utility model for showing the tab and the connecting piece;
[0029] Figure 3 It is a schematic diagram of a battery cell according to an embodiment of the present utility model for showing the structure on the lower side of the sealing plate;
[0030] Figure 4 It is Figure 3 a partial enlarged view of A in
[0031] Figure 5 It is a schematic diagram of a battery cell according to an embodiment of the present utility model for showing the structure of the position of the shielding ring on the cover plate;
[0032] Figure 6 It is Figure 5 a partial enlarged view of B in
[0033] Figure 7 Schematic diagram of a battery cell according to an embodiment of the present utility model for embodying the structure of a sealing plate;
[0034] Figure 8 is Figure 7 Schematic cross-sectional structure diagram at C-C in
[0035] Figure 9 is Figure 8 Partial enlarged schematic diagram of D in
[0036] Description of reference numerals:
[0037] 100, housing; 200, cover plate; 201, terminal post; 202, through groove; 300, connecting piece; 400, electrode group; 401, tab; 500, sealing plate; 501, liquid injection hole; 502, explosion-proof valve; 503, shielding ring; 504, communication groove; 505, clamping groove; 600, insulating pad; 601, clamping block; 6011, elastic convex block; 6012, root; 6013, engaging portion. Specific embodiments
[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.
[0039] Next, in conjunction with Figures 1 to 9 , the embodiments of the present utility model will be described.
[0040] According to an embodiment of the present utility model, on the one hand, a battery cell is provided. Please refer to Figures 1 to 4, including: a housing 100 with an opening on the upper side; a cover plate 200, the peripheral contour of which is adapted to the shape of the opening of the housing 100. A pair of terminal posts 201 are installed on the cover plate 200, and the terminal posts 201 penetrate through the cover plate 200. A through groove 202 is provided between the pair of terminal posts 201 on the cover plate 200; a pair of connecting pieces 300, one end of each connecting piece 300 is connected to the corresponding terminal post 201, and the other end extends to the position of the through groove 202; a pole group 400 is arranged in the housing 100. One end of the pole group 400 is provided with a pole tab 401, the pole tab 401 extends upward and bends towards the connecting piece 300, and the bent part of the pole tab 401 abuts against the upper surface of the connecting piece 300; a sealing plate 500, the peripheral contour of which is adapted to the through groove 202. The sealing plate 500 is provided with a liquid injection hole 501. A shielding ring 503 is provided at the position of the liquid injection hole 501 on the lower surface of the sealing plate 500. At least one communication groove 504 penetrating through the peripheral side wall of the shielding ring 503 is provided on the shielding ring 503. A plurality of clamping grooves 505 are further provided on the lower side plate surface of the sealing plate 500. An explosion-proof valve 502 is provided on the sealing plate 500, and the explosion-proof valve 502 is located on one side of the sealing plate 500; an insulating pad 600 is arranged on the lower side of the sealing plate 500 and has a shape adapted to the sealing plate 500. A plurality of clamping blocks 601 adapted to the corresponding clamping grooves 505 are provided on the upper side of the insulating pad 600, and the clamping blocks 601 are clamped with the clamping grooves 505.
[0041] In this embodiment, the cover plate 200 is separately provided from the housing 100, which facilitates the installation of components such as the electrode group 400 into the housing 100. A through groove 202 is provided on the cover plate 200. The electrode group 400 is located inside the housing 100, and the electrode tab 401 extends from a position opposite to the through groove 202, facilitating the welding operation of the connecting piece 300 and the electrode tab 401 by the staff. Since one end of the connecting piece 300 is connected to the terminal post 201 and the other end extends to a position opposite to the through groove 202 and is connected to the electrode tab 401, the terminal post 201, the connecting piece 300, and the electrode tab 401 are arranged in a staggered manner along the direction parallel to the plate surface of the cover plate 200, saving the space in the housing 100 in the height direction and providing more space for the arrangement of the electrode group 400, thereby improving the performance of the battery cell. In addition, although the electrode tab 401 is arranged near the liquid injection hole 501, due to the provision of a plurality of shielding rings 503 on the sealing plate 500, the shielding rings 503 are located on the lower side of the sealing plate 500 and surround the circumferential direction of the liquid injection hole 501. During the liquid injection or vacuum pumping operation, even if the high-temperature tape fixing the electrode tab 401 is disturbed and displaced, it is not easy to block the liquid injection hole 501 under the limitation of the shielding ring 503. At the same time, the communication grooves 504 provided on the shielding ring 503 provide a more sufficient space for the passage of air flow and liquid flow, making the vacuum pumping and liquid injection processes faster and further reducing the possibility of the liquid injection hole 501 being blocked, so that it is not easy to affect the assembly and processing process of the battery cell. The insulating pad 600 provided on the lower side of the sealing plate 500 is fixedly installed with the sealing plate 500 through the cooperation of the clamping blocks 601 and the clamping grooves 505, enabling the insulating pad 600 to be firmly combined with the sealing plate 500 while also being quickly assembled onto the sealing plate 500, improving the processing efficiency of the battery cell. In addition, by integrating the explosion-proof valve 502 on the cover plate 200 and located on the upper side of the battery cell, when the explosion-proof valve 502 relieves pressure on the battery cell in thermal runaway, it can more smoothly discharge the gas generated inside the battery, improving the safety factor of the battery cell.
[0042] In the above embodiment, specifically, a pair of terminal posts 201 are respectively arranged at both ends of the cover plate 200 in the length direction and are respectively connected to the positive and negative electrodes of the electrode group 400, and the through groove 202 is located between the two terminal posts 201. The connecting piece 300 is arranged in a sheet shape similar to a flat plate, and the connecting piece 300 includes a terminal post 201 connecting portion and an electrode tab 401 connecting portion that are connected to each other. The terminal post 201 connecting portion and the electrode tab 401 connecting portion can be integrally provided or separately provided and connected to form a whole by welding or other means. Among them, the terminal post connecting portion is located at the lower end of the terminal post 201 and is welded to the terminal post 201, and the electrode tab 401 connecting portion extends to the through groove 202 adjacent to the terminal post 201.
[0043] The electrode group 400 includes at least one electrode core. The tab 401 of the electrode core extends from a position near the through groove 202, and is attached to the tab 401 connection portion of the connection piece 300 by bending and welding, realizing electrical connection with the connection piece 300. Also, since the connection portion of the pole column 201 of the connection piece is electrically connected to the pole column 201, electrical connection between the tab 401 and the pole column 201 is thus realized. Exemplarily, the electrode group 400 includes two electrode cores arranged side by side. The tabs 401 of the two electrode cores extend from the corresponding electrode cores on the opposite sides along the width direction of the electrode group 400 and extend towards the connection piece 300. After the tabs 401 contact the side wall of the connection piece 300, they are bent upwards and then bent in the horizontal direction, so as to abut against and be welded to the upper side of the electrode plate.
[0044] In addition, specifically, the specific form of the shielding ring 503 is not limited in the above embodiments. Exemplarily, the shielding ring 503 can be an upwardly convex flange integrally provided with the sealing plate 500. In some embodiments not shown, the shielding ring 503 can also be a convex block connected to the sealing plate 500 by fasteners such as welding, bonding, or screws.
[0045] In one embodiment, please refer to Figure 4 , there are multiple communication grooves 504, and the multiple communication grooves 504 are evenly spaced in the circumferential direction of the shielding ring 503.
[0046] In this embodiment, the communication grooves 504 are arranged at the gaps between adjacent shielding rings 503, so as to form a channel for ensuring the passage of air flow or liquid electrolyte between the shielding rings 503 on the periphery of the liquid injection hole 501. During the liquid injection process and the vacuum pumping process, the efficiency of air extraction or liquid electrolyte injection can be improved, and thus the processing efficiency of the battery cell can be improved. In addition, since there are multiple communication grooves 504 and the multiple communication grooves 504 are evenly distributed in the circumferential direction of the liquid injection hole 501, when the staff performs the liquid injection or air extraction process, the flow direction of the air or liquid electrolyte passing through the communication grooves 504 will not be overly concentrated, so as to avoid strong disturbance to the structure around the liquid injection hole 501, especially to avoid the disturbance of the air or liquid electrolyte to the tab 401 and the high-temperature adhesive, resulting in the high-temperature adhesive and other structures being displaced from their original positions and blocking the liquid injection hole 501, affecting the processing of the battery cell.
[0047] In one embodiment, please refer to Figures 4 to 6 , the communication groove 504 extends to the end face of the shielding ring 503 away from the liquid injection hole 501. The distance between the end of the communication groove 504 close to the liquid injection hole 501 and the lower orifice of the liquid injection hole 501 is s, and s = 0.05 mm.
[0048] In this embodiment, by controlling the distance between the communication groove 504 and the lower orifice of the liquid injection hole 501, it is avoided that when the distance is too large, the guiding effect of the communication hole on the air flow or liquid flow is weak and cannot meet the requirements of rapid vacuum pumping or rapid electrolyte injection. At the same time, when the distance is too small, the structure strength of the shielding ring 503 at the position where the communication hole is opened is weak and it is easy to disintegrate under the disturbance of the air flow or liquid flow, resulting in structural failure.
[0049] In one embodiment, the width of the communication groove 504 along the tangential direction of the shielding ring 503 is d, and d≥0.25mm is satisfied. The height of the communication groove 504 along the axis direction of the liquid injection hole 501 is h, and 0.5mm≥h≥0.3mm is satisfied.
[0050] In this embodiment, since the communication grooves 504 are evenly spaced on the shielding ring 503, by ensuring the length of the communication grooves 504, there is sufficient space between adjacent shielding rings 503, so that the shielding ring 503 has sufficient elasticity to avoid hard contact between the shielding ring 503 and structures such as the tab 401 during the cell assembly process, resulting in scratching or tearing of the tab 401 and affecting the cell performance.
[0051] In one embodiment, the height of the shielding ring 503 along the axis direction of the liquid injection hole 501 is H, and H≥0.5mm is satisfied.
[0052] In this embodiment, by controlling h and ensuring H≥0.5mm, the ability of the shielding ring 503 to prevent the liquid injection hole 501 from being blocked is further improved. And when the high-temperature tape is attached to the end of the shielding ring 503 far from the cover plate 200, since the shielding ring 503 has sufficient height, there is still enough space for the air flow or electrolyte to flow through the gaps between the shielding rings 503, ensuring the smooth processing and enabling the cell to be injected with sufficient liquid electrolyte to ensure the wetting effect of the liquid electrolyte in the cell.
[0053] In one embodiment, please refer to Figures 7 to 9 , the clamping block 601 includes a plurality of elastic protrusions distributed in a circular array. The elastic protrusion includes a root portion 6012 and a clamping portion 6013. The root portion 6012 is connected to the insulating pad 600, and the clamping portion 6013 is provided on the side of the root portion 6012 away from the insulating pad 600 and extends toward the circumference of the clamping block 601 and engages with the clamping groove 505.
[0054] Specifically, in this embodiment, the number distribution of the elastic bumps 6011 that make up the same engaging block 601 is not limited. Exemplarily, there may be two elastic bumps 6011, and the roots 6012 and the engaging portions 6013 of the elastic bumps 6011 are both semi-circular. In some embodiments not shown, there may also be four elastic bumps 6011, and the roots 6012 and the engaging portions 6013 of the elastic bumps are both fan-shaped.
[0055] In this embodiment, the engaging block 601 is formed by arranging a plurality of elastic protrusions in a circular array. During the process of the engaging block 601 entering the engaging groove 505, the root 6012 is used to connect the engaging portion 6013 to the insulating pad 600. The engaging portions 6013 of the respective elastic protrusions are displaced in the direction of the axis of the engaging block 601 under the extrusion of the notch of the engaging groove 505. After the engaging portion 6013 of the engaging block 601 enters the inside of the notch of the engaging groove 505, the engaging portion 6013 expands in the direction away from the axis of the engaging block 601 under the action of elasticity, so as to be snapped into the engaging groove 505, realizing the combination of the insulating pad 600 and the sealing plate 500.
[0056] In one embodiment, the width of the root 6012 in the radial direction of the engaging block 601 is W1, and 1.2 mm ≥ W1 ≥ 0.35 mm is satisfied.
[0057] In this embodiment, by restricting the width of the root 6012, it is possible to prevent the elastic force of the elastic protrusion from being too large due to too large a width, resulting in a situation where it is difficult to assemble the sealing plate 500 and the insulating pad 600. At the same time, it is also possible to prevent the combination strength between the elastic protrusion and the insulating pad 600 from being weak due to too small a width, and the elastic protrusion is easily separated from the insulating pad 600, thereby improving the reliability of the structure.
[0058] In one embodiment, the width of the engaging portion 6013 in the radial direction of the engaging block 601 is W2, and W2 ≥ 0.5 mm is satisfied.
[0059] In this embodiment, by restricting the width of the engaging portion 6013, the engaging block 601 and the engaging groove 505 have sufficient contact area to prevent the engaging block 601 from exiting the engaging groove 505 after entering the engaging groove 505, thereby improving the combination reliability of the insulating pad 600 and the sealing plate 500, and avoiding the situation where the insulating pad 600 falls off or deviates from its original position on the sealing plate 500, resulting in a short circuit between the live part and the housing 100, and further causing a leakage accident of the housing 100.
[0060] In one embodiment, the thickness of the sealing plate 500 is T, and 1.8 mm ≥ T ≥ 1.2 mm is satisfied. The thickness of the root 6012 is t1, and the thickness of the engaging portion 6013 is t2, and 0.55 mm ≥ t1 ≥ 0.25 mm, 0.55 mm ≥ t2 ≥ 0.2 mm are satisfied.
[0061] In this embodiment, by controlling the ratio of the thickness of the sealing plate 500 to the thickness of the root 6012 and the engaging portion 6013 of the elastic protrusion, it is avoided that the thickness of the sealing plate is too low compared with the elastic protrusion, resulting in a weak strength of the sealing plate 500 and being easily damaged. At the same time, it is also avoided that the thickness of the sealing plate 500 is too large compared with the elastic protrusion, resulting in too small a size of the elastic protrusion and affecting the stability of the insulating pad 600.
[0062] According to an embodiment of the present invention, on the other hand, there is also provided a battery pack, including: a plurality of the above-mentioned battery cells.
[0063] In this embodiment, the battery cell group in the battery pack is composed of the above-mentioned battery cells, thereby improving the reliability of the battery pack, and by setting the structure of the shielding ring 503, the situation that the tab 401 and the high-temperature adhesive block the liquid injection hole 501 is avoided, the processing efficiency is stabilized, and thus the production efficiency of the battery pack is indirectly improved.
[0064] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims
1. A battery cell, characterized in that: include: A shell body, with an opening on the upper side; A cover plate, the circumferential side profile of which is adapted to the opening shape of the shell, a pair of poles are mounted on the cover plate, the poles penetrate the cover plate, and a through slot is provided on the cover plate between the pair of poles; A pair of connecting pieces, one end of each connecting piece is connected to the corresponding pole, and the other end extends to the position of the through slot; An electrode group is arranged in the housing, and an electrode ear is arranged at one end of the electrode group. The electrode ear extends upward and bends toward the connecting piece, and the bent portion of the electrode ear abuts against the upper surface of the connecting piece; A sealing plate, the circumferential profile of which is adapted to the through groove, a liquid injection hole is provided on the sealing plate, a shielding ring is provided on the lower surface of the sealing plate at the liquid injection hole, at least one connecting groove penetrating the circumferential side wall of the shielding ring is provided on the shielding ring, a plurality of clamping grooves are also provided on the lower side plate surface of the sealing plate, an explosion-proof valve is provided on the sealing plate, and the explosion-proof valve is located on one side of the sealing plate; The insulating pad is arranged on the lower side of the sealing plate and has a shape adapted to the sealing plate. The upper side of the insulating pad is provided with a plurality of clamping blocks adapted to the corresponding clamping grooves, and the clamping blocks are clamped with the clamping grooves.
2. The battery cell according to claim 1, characterized in that: There are a plurality of communicating grooves, and the plurality of communicating grooves are evenly spaced and distributed in the circumference of the shielding ring.
3. The battery cell according to claim 2, characterized in that: The connecting groove extends to the end surface of the shielding ring away from the injection hole, and the distance between one end of the connecting groove close to the injection hole and the lower side opening of the injection hole is 0.05 mm.
4. The battery cell according to claim 2, characterized in that: The width of the connecting groove along the tangent direction of the shielding ring is d, and satisfies d≥0.25mm. The height of the connecting groove along the axial direction of the injection hole is h, and satisfies 0.5mm≥h≥0.3mm.
5. The battery cell according to claim 2, characterized in that: The height of the shielding ring along the axial direction of the injection hole is H, and satisfies H≥0.5mm.
6. The battery cell according to any one of claims 1 to 5, characterized in that: The clamping block includes a plurality of elastic protrusions distributed in a circular array, the elastic protrusions include a root and a clamping portion, the root is connected to the insulating pad, the clamping portion is arranged on a side of the root away from the insulating pad and extends toward the peripheral side of the clamping block and is clamped with the clamping groove.
7. The battery cell according to claim 6, characterized in that: The width of the root portion along the radial direction of the clamping block is W1, and satisfies 1.2 mm ≥ W1 ≥ 0.35 mm.
8. The battery cell according to claim 7, characterized in that: The width of the engaging portion along the radial direction of the engaging block is W2, and satisfies W2≥0.5 mm.
9. The battery cell according to claim 6, characterized in that: The thickness of the sealing plate is T and satisfies 1.8 mm ≥ T ≥ 1.2 mm, the thickness of the root portion is t1, the thickness of the engaging portion is t2 and satisfies 0.55 mm ≥ t1 ≥ 0.25 mm and 0.55 mm ≥ t2 ≥ 0.2 mm.
10. A battery pack, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 9.